Abstract
The permittivity and AC conductivity in the temperature range 290 K- 460 K, in the frequency range 5.0 Hz-4.0 kHz, magnetic susceptibility over the temperature range 80K-460K, at different magnetic fields as well as x-ray diffraction and IR spectra have been measured for the biodegradable materials [A]2MCl4, in which A is cyclopentan-onyl-2,5-di(p-aminobenzylidine) and M = Mn+2, Co +2 and Cu +2. X-ray analysis indicated that the materials crystallize in orthorhombic unit cell of dimensions a = 15.41(1) Å, b= 16.77(1) Å, c= 19.38(1) Å, a= 15.75(1) Å, b= 16.95(1) Å, c= 19.56(1) Å and a = 15.89(l)Å, b = 17.53(l)Å, c = 20.01(2)Å for the Mn +2, Co+2 and Cu +2 materials, respectively. Electric and magnetic results indicate the following structural phase transitions: The conductivity follows Arrhenius relation. Near room temperature the activation energies are small and have nearly the same value (ΔEa∼170meV) for the three materials. At the high temperature phase, ΔE1 is frequency dependent and follows the relationship ΔE = ΔE0 [1 - exp - (f0/f)]α with Eo varies from 1.2eV (Mn) to 2.88 eV (Cu). The frequency dependence of conductivity follows the universal power law [sgrave]∼ B(T)ωs(T) Variation of s(T) and In B(T) with temperature shows discontinuities at the phase transitions. At high temperatures, phase (I), band type conduction prevails
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
